A hybrid inductor-current sensor with fast response and high accuracy using online calibration for high-frequency BUCK DC-DC converters

被引：0

作者：

Yuan, Wentai ^{[1
]}

Xie, Weitao ^{[1
]}

Chen, Zhijian ^{[1
]}

Lin, Xiaoling ^{[2
]}

Tang, Xian ^{[3
]}

Zheng, Yanqi ^{[1
]}

机构：

[1] South China Univ Technol, Sch Microelect, Guangzhou, Peoples R China

[2] China Elect Prod Reliabil & Environm Testing Res I, Sci & Technol Reliabil Phys & Applicat Elect Compo, Guangzhou, Peoples R China

[3] Tsinghua Univ, Grad Sch Shenzhen, Shenzhen, Peoples R China

来源：

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS | 2024年

基金：

中国国家自然科学基金;

关键词：

digital adaptive on-time (AOT) controlled; digital current balance; high-frequency BUCK DC-DC converter; hybrid inductor-current sensor; online calibration; AOT BOOST CONVERTER; SCHEME; TIME; LOOP;

D O I：

10.1002/cta.4216

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper introduces a hybrid inductor-current sensor with fast response and high accuracy using online calibration for 25 MHz BUCK DC-DC converter. The proposed inductor-current sensor combines the high accuracy of the senseFET sensing method with the lossless and real-time response characteristics of the RC filter technique. Comparing to exist techniques, the proposed calibration scheme can make filter coefficient converge even in unsteady state, which improve its effectiveness in practical application. Moreover, the proposed inductor-current sensor utilizes sample-based senseFET-based current sensing to offer calibration reference, which avoid the use of high bandwidth amplifier. Digital current balance control is seamlessly integrated into the 25 MHz 2-phase digital adaptive time-controlled (AOT) BUCK DC-DC converter through the utilization of the proposed hybrid inductor-current sensor. The 2-phase BUCK DC-DC converter is implemented in a standard 0.18-mu m CMOS process. After online calibration, proposed hybrid inductor-current sensor outputs a full-wave waveform with high accuracy and low propagation delay of only 9 ns in post-layout simulation. This article introduces an integrated hybrid inductor-current sensor with fast response and high accuracy using online calibration for high-frequency BUCK DC-DC converter. Proposed hybrid inductor-current sensor combines the high accuracy of the sample-based senseFET-based sensing method with the lossless and real-time response characteristics of the RC filter technique. Online calibration scheme of the hybrid inductor-current sensor can make filter coefficient converge even in unsteady state, which improve its effectiveness in practical application. image

引用

页数：19

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